At night, various sounds emanate from homes. A common question arises: are those faint, high-pitched sounds a “chirp,” and could they be coming from mice? Understanding the sounds mice make can help identify their presence and shed light on their nocturnal activities.
Do Mice Really Chirp?
Mice do not “chirp” like birds. However, they are highly vocal creatures that emit a range of high-frequency sounds, some of which can be perceived by humans as faint squeaks, whistles, or rapid, short vocalizations. These sounds are more noticeable at night because mice are primarily nocturnal, and household ambient noise is typically lower.
Many mouse sounds are ultrasonic, meaning their frequencies exceed 20 kilohertz (kHz), above human hearing. While humans cannot consciously detect these ultrasonic communications, some individuals with acute hearing might occasionally pick up the very lowest frequencies, contributing to a “chirping” perception. What is often heard as a “chirp” is more accurately a high-pitched squeak or a very brief, sharp vocalization within the human audible range.
The Purpose of Mouse Vocalizations
Mouse vocalizations serve communication functions within their social structures. Male mice produce complex ultrasonic vocalizations during courtship to attract females and indicate fitness. These calls vary in patterns and frequencies, providing information to potential mates.
Mice also use sounds for social interactions, such as establishing dominance or identifying individuals. Pups emit distress calls, often ultrasonic, when separated from their mother or threatened. These calls prompt the mother to locate and retrieve her offspring, demonstrating a parental response. Mice also use audible and ultrasonic sounds as alarm signals to warn others of potential dangers, like the presence of a predator.
Other Sounds Mice Make
Beyond vocalizations, mice produce other sounds indicating their presence in a home. Gnawing is a common audible sign, as mice chew materials to wear down their continuously growing incisors. This gnawing can be heard on wood, plastic, electrical wires, or food packaging, often creating a scratching or scraping noise.
Scurrying is another sound, occurring as mice move swiftly across surfaces, inside walls, or through attics. This manifests as light, quick pattering or faint rustling. Scratching noises, distinct from gnawing, may also be heard as mice navigate tight spaces or climb within structures. These sounds differ from insects (clicking or buzzing) or larger rodents (heavier thuds and louder movements).